Device for indicating variation in flow of liquids



Oct. 16, 1928. 1 1,687,627

. w. L. MARDEN.

DEVICE FOR INDICATI NG VARIATI'U'N IN FLO W 0F LIQUIDS Filed April 24.1926 |hill- I, I i a a; l MI 2 a i h 1 a5 I H. W

' IINVENTOB I WILLIAM L. manuals, on NEW YORK, N. Y.,

P TENroFFICE.

assmnoa'ro nnrrimn METER COMPANY,

OF NEW YORK, N. .Y., 'A CORPORATION OF NEW JERSEY.

'nnv'xcii non mmca'rrne VARIATION IN FLOW on L'IeUIns.

Application filed April 24,

In the operation of high power radio transmitters it is necessary towater-jacket the vacuum tubes and to maintain, during operation, aconstant and uniform circulation of water in order that the vacuumtubesmay be kept constantly cool. Any substantial reduction in thecirculation of the cooling'water results in destruction of the vacuumtubes; The object of the present intention is to provide reliable meanswhereby any substantial reduction in the flow of water. under suchcircumstances, shall be indicated, or shall be made to operate a. signalof some sort,'or,

- preferably, shall be made to interrupt the circuit of the vacuum tubesand so save itfrom destruction. The invention has been developed withparticular reference to the protection of vacuum tubes in radiotransmission installations, but it will be obvious that it is capable ofapplication in various other arts,

in which the diminution of the flow of a liquid is to be indicated or toeffect an operation of some sort. In accordance with the inventron, anoperating plunger 1s arranged to be maintained in normal position by thehydrostatic pressure differential between an inlet chamber and an outletchamber which com municate with each other through an aperture which,being of predetermined area, permits a predetermined flow, a variationin pressure'differential due to a variation in the flow beingaccompanied by a movement of the plunger which effects an indication ofthe variation in flow or some other desired result, such as theinterruption of the circuit through a vacuum tube.

The invention will be explained more fully hereinafter with reference tothe accompanying drawing, the single figure of which is ,a view partlyin elevation and partly in ver tical section ofa convenient embodimentof the invention in association with an electrical circuit.

In the embodiment of the invention illustrated, asubstantiallycylindrical shell a is provided interiorly with diaphragmsa' and a which form an inlet chamber a, an outlet chamber a, and anoperating chamber a.' For convenience in manufacture, one-end oi theshell is fitted with a removable plug 6 and the other end of the shellis fitted witha plug .0, which is also removable and, in the presentinstance, is shown as made of insulating material as-a carrier forcircuit terminals to be referred to. The cooling water or the liquid,

192s. Serial No. 104,435.

the flow of which is to be maintained, is delivered to the chamber athrough a suitable connection d and is conducted .away from the chambera through a suitable connection 6,

and the two chambers a and a communicate through an aperture a which, inthis instance,

is shown as axizfl and is of predetermined area. As shown, the aperture(19 is provided with a bushing a which may be replaced for the purposeof securing the proper area of the aperture.

VVithin the-shell a is placed a plunger f i which is movable axally andis guided at its lower end upon a pin 6 projecting from the plug b, andat its upper end, with a close working fit, in an aperture in thediaphragm a In' this instance the plunger passes through the aperture awitha free space about it, such space forming the controlling openingbetween the two chambers a and a through which the liquid must flow inits movement.

.In the construction shown, the of flow, under given conditions ofsupply, is such that the hydrostatic pressure differential between theinlet chamber a and the outlet chamberafl determined by the measuredaperture a, maintains the plunger f in an elevated position, while undera diminution of flow, re-

iiormal rate sulting in a decrease of the pressure difierential betweenthe two chambers, the plunger falls.

The movement of the plunger under a VEI'I'. ation of the pressuredifferential between the two chambers can be taken advantage of invarious ways, either to indicate a diminution of flow'or'to efiect someoperation, such as the opening of the circuit of a vacuum tube. In theapplication of the invention illustrated in the drawing, the upper endof the plunger 7, within the chamber a (into which no appreciablequantity of liquid enters, the closure at; the upper end beingair-tight) .coacts with a circuit breaker g, which is weighted andpivoted in the end of a binding post hand has a contact point g adaptedfor 1 contact with the end of another binding post 2', butheld normallyout of contact therewith by the plunger f when the latter is in itselevated position. In the arrangement shown, the two binding posts haveconnected thereto the terminals of a circuit Z, which includes a sourceof energy Z and an-electro-magnetic device Z which may carry abridgepiece I to close the ga between two terminals 1 of the circuit, orexample,- of the vacuum I an inlet cham ously, a connection let chamber,

tube tobe(protected. Solon lunger f is ld in its ele-' normal an thevated position, t e 'CllClllt Z is broken at the point g and the bridgepiece Z closes the ap between the terminals 1, but ifthe flow su ersadiminution suificient to permit the'plun'ger f to drop, the circuit 1Wlll be comp eted at the point 9 and the bridge piece Z )will Open thegap between the terminals Z. It will be understood thattheelectro-magnetic device I may itself serve as one 'form of indicatoror it may have a function .such as that of opening a. circuit. 7 In anycase,the operation which is the primary purpose of the movement of theplunger under a variation in flow 1s eflected by a the movementitself.

It will be understood that various changes in details of constructionand arrangement can be made to suit difi'er'ent conditionsof use and,that, except claims, the invention is not restricted to the articularconstruction shown and described erein. I

I claim as my invention:

1. A device for indicating variation in flow of moving li uidscomprising a shell with r and an outlet chamber, a constantmeasuredaperture connecting the two through which the liquid flows continufromthe source of liquid supply to the inlet chamber, a discharge connectionfrom the outlet chamber, and a plunger movable in the shell under theinfluence of a differential of hydrostatic pressure between'the twochambers.

2. A device for indicating variation in flow of liquids comprising ashell with an inan outlet chamber communicating-with the inlet chamberthrough a measured aperture and an operatin chamber, a connection fromthe source of liquid supply to the inlet chamber, a discharge connectionof the plunger from the outlet chamber, and a plun er having one end inthe iplet chamber and t e other end in the operating chamber and movableunder the influence of a differential of hydros'taticpressurebetweenthetwo chambers.

3. A device for indicating variation in flow of 'liquids comprising ashell'with an as pointed out in the apertured diaphragm" forming aninlet c amber and an outlet chamber, a connection 1 from the sourceoi.liquid supply to the inlet chamber, a discharge connectionfrom theoutlet chaml'ier a and a plunger -movable through'the apertured diahraunder the influence of adiflerentia'l ohy rostaticpressure between'the two chambers, v r

*4. A device. for. indicating variation in flow of liquids comprising ashell with two apertured 'diaphragms forming an inlet chamber, an outletchamber and an operatin chamber, a connection from the source 0 liquidsupply to the inlet chamber, a discharge connection fromthe outletchamber, and a plunger movable through the apertures of thediaphragms'under the infiuence'of a diflerential of hydrostatic pressurebetween the inlet chamber and the outlet chamber. 4

5. A device for indicating variation in flow of liquids-comprising ashell with'an inlet chamber and an outlet chamber communicating througha constant measured aperture, a connection from the source of liquidsup: ply to the inlet chamber, a discharge connection from the outletchamber, afplunge'r movable in the shell under the influence of adifferential of hydrostatic pressure due to the flow of liquid betweenthe two chambers, and devices operated by the movement of the plunger toindicate a variation in the pressure eating through a measured aperture,acon- X nection from the source. of liquid supply to the inlet chamber,a discharge connection from the outlet chamber, a plun er movable in theshell under the influence o a differential of hydrostatic pressurebetween the two chambers, insulated circuit terminals carried by theshell, and a contact breaker inoperative relation with-the plunger'antladapted to make and break the circuit, between said terminals.

This specification signed this 22 day of April, A. n. 1926. WILLIAM-1L.MARDEN.

